什么是匹配 URL 的好的正则表达式?

问题描述

目前我有一个输入框，可以检测 URL 并解析数据.

Currently I have an input box which will detect the URL and parse the data.

所以现在，我正在使用:

So right now, I am using:

var urlR = /^(?:([A-Za-z]+):)?(/{0,3})([0-9.-A-Za-z]+)
           (?::(d+))?(?:/([^?#]*))?(?:?([^#]*))?(?:#(.*))?$/;
var url= content.match(urlR);

问题是，当我输入像 www.google.com 这样的 URL 时，它不起作用.当我输入 http://www.google.com 时，它正在工作.

The problem is, when I enter a URL like www.google.com, its not working. when I entered http://www.google.com, it is working.

我对正则表达式不是很流利.有人可以帮我吗?

I am not very fluent in regular expressions. Can anyone help me?

推荐答案

Regex 如果你想确保 URL 以 HTTP/HTTPS 开头:

Regex if you want to ensure URL starts with HTTP/HTTPS:

https?://(www.)?[-a-zA-Z0-9@:%._+~#=]{1,256}.[a-zA-Z0-9()]{1,6}([-a-zA-Z0-9()@:%_+.~#?&//=]*)

如果您不需要 HTTP 协议:

If you do not require HTTP protocol:

[-a-zA-Z0-9@:%._+~#=]{1,256}.[a-zA-Z0-9()]{1,6}([-a-zA-Z0-9()@:%_+.~#?&//=]*)

要尝试此操作，请参阅 http://regexr.com?37i6s，或查看更少的版本限制性http://regexr.com/3e6m0.

To try this out see http://regexr.com?37i6s, or for a version which is less restrictive http://regexr.com/3e6m0.

示例 JavaScript 实现:

Example JavaScript implementation:

var expression = /[-a-zA-Z0-9@:%._+~#=]{1,256}.[a-zA-Z0-9()]{1,6}([-a-zA-Z0-9()@:%_+.~#?&//=]*)?/gi;
var regex = new RegExp(expression);
var t = 'www.google.com';

if (t.match(regex)) {
  alert("Successful match");
} else {
  alert("No match");
}

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